NMS-8280 System ROMs dumped. Disk ROM doesn't match 8250

بواسطة donluca

Expert (75)

صورة donluca

02-05-2020, 16:54

Thanks to NYYRIKKI's help I was able to dump my NMS-8280 System ROMs.

The Bios and Extended ROMs match those of the 8250, but the Disk ROM is different, sha1 69f3dbfc1d516cd09a1a7e286049f99e37ca90d9

I've dumped it several times and checked if it's a bad dump but it turned out to be good.

The 8280 is 100% stock.

Login أوregister لوضع تعليقاتك

بواسطة Manuel

Ascended (19273)

صورة Manuel

02-05-2020, 22:25

I checked the diskROM, but as usual when dumping diskROMs from within the MSX itself, the memory mapped FDC registers in the diskROM area are also dumped, and they can very a lot. That's causing a unique disk ROM sha1sum. When clearing these bits to 0xFF, you get c3efedda7ab947a06d9345f7b8261076fa7ceeef which found also in (many) 8250 machines.

بواسطة donluca

Expert (75)

صورة donluca

02-05-2020, 23:58

Thanks! I was actually going to post your reply to my mail later to this thread.

I'll try to change the title of the thread to "8280 System ROMs dumped, match 8250" to better reflect the findings.

EDIT: nevermind, I can't edit the thread anymore. Oh well Tongue